<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <?php

//        echo mt_rand(1,10);

    ?>
<link href="style<?php echo mt_rand(1,3);?>.css" rel="stylesheet">
</head>
<body>

<h1>后盾网 人人做后盾</h1>

</body>
</html>